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Pre-Production Costs Related to Long-Term Supply Agreements (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Dec. 31, 2017
Pre Production Costs Related to Long Term Supply Arrangements [Line Items]
Pre-production E&D costs for which reimbursement is contractually guaranteed by the customer	$ 67.8	$ 137.4
Pre-production tooling costs related to customer-owned tools for which reimbursement is contractually guaranteed by the customer	100.3	57.6
Cash collected related to E&D and tooling costs	165.4	$ 171.0
Recoverable customer E&D and tooling	304.9		$ 307.4
Current
Pre Production Costs Related to Long Term Supply Arrangements [Line Items]
Recoverable customer E&D and tooling	229.9		248.1
Long-term
Pre Production Costs Related to Long Term Supply Arrangements [Line Items]
Recoverable customer E&D and tooling	$ 75.0		$ 59.3

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- Definition

Pre Production Costs Related to Long Term Supply Arrangements [Line Items]

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Amount of recoverable preproduction engineering and design costs related to long term supply agreements capitalized during the reporting period.

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Amount of recoverable preproduction tooling costs related to long term supply agreements capitalized during the reporting period.

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Cash recoveries of preproduction engineering, design and tooling costs incurred on behalf of a customer.

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The carrying amount as of the balance sheet date of capitalized preproduction costs incurred on long-term supply arrangements, including recoverable costs to design and develop products.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
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